METHOD FOR CONTRACTING NICKEL FROM USED SOLUTIONS OF CHEMICAL NICKEL-PLATING

摘要

Usage: in electroplating for the purification of spent electrolytes from nickel ions, utilization of the latter and its return to production. SUMMARY OF THE INVENTION: treating the spent solution with a dry alkaline agent and recovering a nickel-containing precipitate, which is used as an alkali metal carbonate or hydroxide or a mixture thereof. The best results were obtained with a molar ratio of hypophosphite and nickel in the treated solution 2. The optimum temperature is a solution temperature of 70-90 °; C and processing time 30-60 minutes Compared with the known one, it is possible to ensure a nickel content in the precipitate of up to 93% due to its separation from concentrated spent solutions mainly in the form of a metal powder, to ensure a degree of nickel recovery to 98-99.8%, to simplify the utilization and return of nickel to production, and to reduce the degree of contamination knowledge of wastewater. 1 s.p., crystals, 1 tab. sl c